Road-stamping machine



.l April 16, 1929. E. H. cARLssoN ROA? STIIN .ACHINE 4 Sheets-Sheet 'NVENTOR eL/C4, Ahorn ej Ap 16, 1929. E. |14. cARLssoN ROAD STAIPING MACHINE Filed llay 10. 1927 4 Sheets-Sheet 2 AP 16 L1929- E. H. cARLssoN ROAD STMPING' ICHINE Filed May 10, 1927 4 Sheets-Sheet 4 IN V E N T0 R B (M l Y ML Attmev Patented pr. 16, 1929.

PATENT oFFi ERNST HJALMAR .CARLSSON, 0E OSKARSHAMN, SWEDEN.

noAn-sr'AMPING MACHINE.

Application ined May 1, 1927, serial No.

Thisy invention refersto a road 'stamping machine with one or more double-acting stampers working perpendicularly to the road, and the said invention has for its 'object to produce a road stamping machineof a simple and l solid construction and with a very great capacity. i

The accompanying drawings show as 'an example a suitable embodimentof the invention, and f Figure 1 is a side-'view ofthestamping machine, Y

Figure 2 is aplan-view of same, A

` Figure 3 is a front-view of the stamping machine on a larger scale and partly in section on lines 3-3 of Figure 2, igure 4 isr a section on the lines 4-4 of Figure 2, drawn on a larger scale,

vFigure 5 is aside-view on ay greater' scale of two stampers engaging each other,

Figure 6 is a horizontal section on the lines 6-6 of Figure 5, and

Figure 7 is a section through some details on the lines 7&7 of Figure 4. j

4According to the shown embodiment the road' stamping machine is provided with two equal stamping systems, each comprising one Vor more (inthe drawing two) double-acting stampers 1, 2. The stamper 1 has working surfaces 3 at both of its ends, and the stamper 2 is providcdwithtwo working surfaces 4 in the same manner. In the stamper 1 there is a longitudinal groove/5 and the'stamper 2 a similarl groove 6. The'two stampersare adaptedto clasp or engage one another with freedom of motion, yas is especially to be' seen from Figures 2, 5 and 6, Vso that one 'may 'work without being-hindered by' the other.

12 which is' driven in a suitable' `m an'ner.

When the shaft 12 is rotating thediscs 8 are rotated inthe direction of they arrow (Fig- An eccentric 413 is rotatably mountedon the 190,158, and ia swedenv'ranaary 21, 1927. Y Y

lstationary shaft 7 and cooperates with the tric 13 is vfirmly coi'mectedto Va neck or hub 14, Figures 3 and 7, one end of which is pro vided with a toothed wheel 15vr meshing with another Vtoothedy wheel 16 fixed on a rotatable isdriven in a suitablemanner.

` On the stationary main shaft 7 'between the discs 8 a cam 18' is fixed for each stamping system said cainserving as a guide for the stampers. Thecam 18 has not `only an arched shaft 17 (best to `be seen in Figure 3) sliding surface 19 extending for some distance alongthe periphery of the' discs 8 but also a vertical sliding surface 20 havingin its middle a projecting ear 21 jammed. on the main shaft 7. The said cam has at its top and at its bottom beveled portions 22 connecting the vertical sliding surface 2O `with Ythe arched sliding surface 19. As isv to be seen from Figures 3 and 7 the cam is provided with a recess 23 opposite to the eccentric 13 so that the eccentric may rotate without being hindered by the cam. v v v The stamping systems are supported by rollers or the like in such a manner that the rotating'discs 8 do not touch the road.` The number of rollers may be aiariedaccording to circumstances. In the shown embodiment there are two anterior rollers 24 stationarilv mounted on a shaft 25 parallel with themain terioriollers 27 fixed'on a shaft 28 o'urnalled kin thefrain'e, F igures'1and2.y To v the posterior rollers 27 drivingpower is transmitted `in a suitable manner from amotor locatedy on the stamping machine for moving the stamping machine forward on the road in one or the otherdirecti'on, the vsaid motor driving also theV discs 8 andthe c ccejntrics 13; According shaft 7 the shaft 25 beingrotatably mounted in the frame 26.k Further, there are two pos-fi" to the drawing `the stamping ymachineis moved forward inthe direction of the arrow l 30, Figure 1. rIhey rollers' v24, 27falso'serve to smooth'the road to Vsome, extentafter the stamping. Evidently,rwheelsmaybe used iristead of the rollers, if desired, but in this c ase The eccentric 13 which is rotated in opposite direction to the discs 8 raises the stamper for a small distance from the road immediately after the downstrolre. Figure 4 shows the eccentric 'just about raising the stamper 1. During the first portion of its upward movement, Figure 4, the stainperv is guided by 'the eccentric 18 and is forced to follow the arched sliding surface 19, and during the last portion of its upward movement, the stamper follows the arched sliding surface on account of its weight. As soon as the stamper 2 has reached the beveledV surface 22 of the cam 18, the stamper slides down on said beveled surface, is released from the pin 9 and falls down along the 'sliding surface 20. As soon as the stamper 2 has fallen down, it is limmediately ,raised by the eccentric 18, as has already been described in connection with the stamper 1. The other stamper 1 continues the whileits swinging motion, and the stamper 2 raised by theeccentric 13 begins again to be swung upwards. YVhen the stamper 1 has reached the upper beveled surface 22the'downstroke is effected in the same manner as has Justbeen described in connection with the other stamper.

As is to be seen Afrom the aforesaid the stampers work perpendicularly to the surface of the road. By choosing a large diameter of the discs 8 so that a great height of fall may be obtained and by rendering thestampers sufhciently heavy very vigourous strokes are effected so that the road is stamped effectively.

' Thefnumber of stampers 1 and 2 of Veach stamping system may be varied according to circumstances. Thusone may use a single stamper, in which case the discs 8, however, must rotate lwith a comparatively great speed, in order `that. a suflicientnumber of strokes per minute may bel obtained. However, it is most advantageous to use two or morel stampi Vers in each stamp1ng'system,in which case one `may let the discs 8 rotate comparatively Vslowly and," neverthelesso ne may obtain a very great number 'of strokes per minute. Presume the discs y8 to make Ytwenty revolutions per minute one obtains with two stampers sixty strokesper'minute. Consequently, the road stamping machine'wi-ll get a very I'great capacity, 'if one lchooses sufficiently ilarge workingr surfaceson'the stampers.

In the'embodiinent shown and described two stamping systems are used but one may, of course, use one stamping system only, 1f

desired,`or alsoY more than two stampingsystems. n

The shown and-described embodiment may evidently be Varied in many respects without the idea underlying the invention being given up.

Having now described my invention, what I claim as new and desire to secure by Letters Patent is: i

1. A road tamping machine, comprising a double end tamper, and means for rotating the tamper from one upright position to another to permit said tamper to fall of its own weight and bring alternate ends thereof into contact with the ground.

2. Aroad tamping machine, comprising a double end tamper, means for rotating the tamper from one uprightposition to another to permit said tamper to fall of its own weight and bring alternate ends thereof into contact with the ground, and means operating subsequent to movement of the tamper into contact with the ground to lift the tamper off the ground before continuing its rotary movement.

3. A road tamping machine, as claimed in claim 2, including means for supporting the tamper in its raised position during rotary movement thereof from one fall to the next and for releasing the said tamper when the latter-has reached its upright position.

4. A road tamping machine, as claimed in tamper comprises a continually revolvingA member having carriers movable with the member into engagement'with the said t-amper in its fallen position to carry the latter to its alternate uprightV position.

5. A road tamping machine, as claimed in claim 2, including a stationary cam in the path of the tamp'erfto support it from one raised position to the next andf for releasing the latter as it reaches its upright position.

6. A road tamping machine, as claimed in claim 2, including a stationary cam having a curved surface disposed in the path of the tamper to support itduring movement thereof from one raised position to the next and an upright guide to guide the tamper in its fall to engage the ground. e f

7.y A road tamping'machine, as claimed in claim 2, including a iixedcam in the path of the .tamper to hold it in'its raised position during movement thereof from one upright position to the next, and in which the means for lifting the tamper, comprises a rotary Acam to first lift the tamper free of the ground and then against the first cam until the tamper has passed the horizontal plane in its upllO tamping surface at opposite ends, which ends are engaged by the connecting pieces to impart movement of the tampers from one upright position to the next, a. fixed Curved cam in the path of the tampers moving from their opposite upright positions to guide them and an upright guide surface to guide the tampers during their fall, and a rotary cam yturning With the axle and engaging eaehtamper subsequent toits fall to lift and support it during 10 its travel to a horizontal plane.

In Witness whereof, Ihave hereunto signed f i my name. 1

ERNST HJALMAR CARILssoN. 'l 

